Dynamometer for casing-screwers and other purposes.



R. W. STEPHENS. DYNAMOMETER FOR CASING SOREWERS AND OTHER PURPOSES. APPLICATION FILED NOV. 1, 1911.

1,080,937, Patented Dec. 9, 1913.

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following is a specification.

' is a side elevation of the dynamometer.

-3 is a vertical v occupied by 'of the invention is STA ES QFFICE.

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I',-"ROSCOE WILLIAM SrrnP nxs, a citizen of the United States, residing at Maricopa, in the county of Kern and State of California, have invented a new and useful Dynamometer for Casing-- of which the Be it known that This invention relates to an improved form of dynamometer adapted for insertion in a tension line to indicate the amount of tension'on said line and the main object to provide a hydraulidynamometer for this purdispensing with the use of said: dynacally o erated pose, t ereby werful and "heavy sprinmometer comprising hydrau ating a-pressure gage and bemg provlded with' means for attachment to the-line in such manner that tension on the line pro-' duces compression in thehydraulic operating means for the ressure gage.

Other objects 0 the invention will appear hereinafter.

The accompanying drawingsillustrate an embodiment of my invention, and referring thereto: Figure 1 is a lan of the strain indicating means in position on the cas'ng in connection with the casing screwing tevice, 1g. 2

' section.

Fig.

the casing being shown in section of a portion thereof. Fig. 4 is a plan of the dynamometer. Fig. 5 is a section on line wm in Fig. 2. Fig. 6 is a section on line ww in Fig.2.

The dynamometer or strain indicator comprises a cylinder 1 closed at its lower end and a piston 2 mounted to slide in said cylinder, a acking ring or leather cup 3 being provi ed in the wall of the cylinder to we a tight sliding joint. The space 4 wit in the cylinder and below the piston is liquid indicated at 5 and a channel 6 18 formed in the closed lower end of the, cylinder leading to a recess 7 1n 4 the side of the lower end portions of thecylinder. A

ressure gageof an suitable type is -provi ed in said recess, t e o rative or pressure receiving member ,9 0 said pressure gage being conne to or communicating with the channel 6. aforesaid, to

from the cylinder. The

receive the pressure 'lpecmcatiumotmetterrratent. Application filed November 1; 1511. Serial no. 658,055.

ic means oper-- pointer 10 for said gage indicates on a dial 11 the pressure existing in the member 9 and in the interior of c linder 1.

Piston 2 is formed with a cross head 12 with which engage nuts 13 on the screw threaded end portions of the longitudinal bars of a U- haped stirrup or mem r 15 A plate 16 extends beneath the closed lower end of cylinder 1,-and engages with nuts 14 screwing on the screw threaded lower ends of the longitudinal bars of a U-shaped stirrup or member 17, the members 15 and 17 serving for attachment of the parts for apthe device. Memlying tension or strain to Patented'Dec, 9,1918.

bers 15 and 17 extend alon side the cylinder 1 and engage in longitu inal grooves 19 in the cylinder 1, thereby maintaining the parts in axial alinement. The respective tension members 15 and 17 are arranged in planestransverse to one another.

In applying the device to indicate the strain on a casing screwer the member 17, for example, is placed over the bar 20 of the tongs for screwing up the casing and the other member 15 is connected to a line or jack 21 for pulling the tongs,-the operation of screwing up the casing proceeding in well known manner by intermittent pu on the said line or jack, and at each operation, the pressure exerted on the tongs is indicated on the'pressure gage, suitable allowance being made for the efiective length of the ton s and for the diameter'of the piston in t e dynamometer. By observing the indications of the dynamometer the operator may be sure that no excessive pressure is brought on the casing, or if the casing is defective and breaks or yields under a pressure which is not excessive, the indications of the dynamometer may be used as evidence to show the defective nature of the casing.

What I claim is: i

A dynamometer comprising a cylinder, hav' one end closed, and a pressure ga e communicating with the interior of the ey inder, a piston slidably mounted in said cylinder, and having extensions at its outer end, a U-formed stirrup having bars exextending beneath the cylinder, a U-formed on the cylinder, a member stirru havi 'bars extending alongside the my hand at Maricopa, California, this 18th cylin er and t rough said member, and nuts day of October, 1911.; on said bars respectively engagin the extensions and the said member, sai cylinder ROSCOE WILLIAM STEP KENS 5 having longitildinal rooves in which said In presence ofbars engage to hold t e parts in a-Iinement. M. N. ROBERTSON, In testimony whereof, I have hereunto 'set -H. F. Mrrcrmnn. 

